Diagnostic Aids
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
The most likely occurrence of this DTC being set are due to incorrect calibration files downloaded to the IPM, or an HVAC control module installed in the vehicle without the recalibration procedure having been performed.
Courtesy of GENERAL MOTORS CORP.